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Engine running temps very wide range, normal?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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rguzz
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Engine running temps very wide range, normal?

Post by rguzz » Wed Dec 25, 2019 12:09 pm

96 855t, very variable operating temps, is this normal? Long uphill climb, 36 degrees out, 200+F degrees, downhill same climb temp drops to 150 degrees, in a very few minutes. Gauge drops down from middle position. General cruising temps 180's, again about 40 degrees outside, pretty consistent. T stat is OEM Volvo, CTS new OEM, Nissens rad is maybe 5 years old. I assume this is all pretty normal, comments? Happy Holidays. BTW, readings are from my OBD2 reader.

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Re: Engine running temps very wide range, normal?

Post by ecbsykes » Wed Dec 25, 2019 1:23 pm

Once warmed up, even on long descents, the coolant shouldn't really drop below the temperature rating of the thermostat. Sounds like yours may be broken (stuck open). It's more normal for temperature variance above that rating, commensurate with load (AC, hills, weights, ambient temp, etc).
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rguzz
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Re: Engine running temps very wide range, normal?

Post by rguzz » Wed Dec 25, 2019 6:20 pm

I've been away from the car for a few months and don't recall these fluctuations in the past. Temp gauge always has been in the middle, with no memory of it ever dropping below that.T stat is maybe 2-3 years old, max. OEM Volvo. Heat appears somewhat to be erratic and dependent on what kind of driving I'm doing, ie warmer when I'm on a long, hard drive. Sounding more like a bad thermostat, doesn't it.

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polskamafia mjl

Re: Engine running temps very wide range, normal?

Post by polskamafia mjl » Wed Dec 25, 2019 9:40 pm

For sure, if its getting so low that its affecting blower temp then its definitely a stuck thermostat.
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Re: Engine running temps very wide range, normal?

Post by bmdubya1198 » Wed Dec 25, 2019 9:53 pm

One more for a bad thermostat... the heat being affected is almost a dead giveaway, given the other issues.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
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abscate

Re: Engine running temps very wide range, normal?

Post by abscate » Thu Dec 26, 2019 3:43 am

My 1999 sits at 87C coolant temp while driving, at idle it will cycle between 87c and 105c as the engine heats up, radiator fan comes on, temp goes back, Maybe 2-3 minutes to creep up,then 30-60 seconds to come back down.

The temp gauge isn’t a precision device.

I logged the temp vs tick mark positions on one of my cars in a thread, it basically a

Cold - correct- Overheat measurement device
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Re: Engine running temps very wide range, normal?

Post by RickHaleParker » Thu Dec 26, 2019 3:58 am

Thermostat response time is slow. Replace Thermostat before it gets really bad and does damage.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

rguzz
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Re: Engine running temps very wide range, normal?

Post by rguzz » Thu Dec 26, 2019 7:40 am

Thanks, will do, absolutely. Disappointed in life of the last replacement. I do carry a spare, time to fish it out. Have a great holiday, everyone.

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Re: Engine running temps very wide range, normal?

Post by RickHaleParker » Thu Dec 26, 2019 7:59 am

rguzz wrote:
Thu Dec 26, 2019 7:40 am
Disappointed in life of the last replacement.
What brand did you use and where did you source it?
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

rguzz
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Re: Engine running temps very wide range, normal?

Post by rguzz » Thu Dec 26, 2019 2:17 pm

Volvo OEM as seen in this video. Mine broke in exactly the same way. Replaced it today with a Wahler, whose internals appear much more robust. Maybe Volvo should no longer be the go to for thermostats anymore. 2 years for me. Looks like a design flaw.

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